Add Node 8 standards to linter (#1313)

* Add Node 8 standards to linter

* Tweak ESLint config

* Convert new rules to WARNs

Author: Ace Nassri

.eslintrc.yml

@@ -2,12 +2,13 @@
 extends:
   - 'eslint:recommended'
   - 'plugin:node/recommended'
-  - prettier
+  - 'prettier'
 env:
   mocha: true
 plugins:
   - node
   - prettier
+  - promise
 rules:
   prettier/prettier: error
   block-scoped-var: error
@@ -19,3 +20,8 @@ rules:
   prefer-const: error
   no-var: error
   prefer-arrow-callback: error
+  no-throw-literal: warn
+  require-await: warn
+  promise/prefer-await-to-then: warn
+  promise/no-nesting: warn
+  prefer-destructuring: warn

package.json

@@ -23,6 +23,7 @@
     "eslint-config-prettier": "^4.0.0",
     "eslint-plugin-node": "^9.0.0",
     "eslint-plugin-prettier": "^3.0.0",
+    "eslint-plugin-promise": "^4.1.1",
     "prettier": "^1.15.2"
   }
 }